Can an S series switches forward a packet if both the source and destination IP addresses of the packet are multicast addresses

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The S5710-C-LI or S5700SI drops packets whose source and destination IP addresses are both multicast addresses.
Other switches broadcast such packets in a VLAN.

Other related questions:
How to display the source and destination addresses of forwarded packets on S series switches
For S series switches (except the S1700), no command is available to display the source or destination addresses of the forwarded packets. If you want to obtain the addresses, use a tool to capture packets.

What functions on S series switches can analyze source and destination IP addresses in data packets
NetStream and sFlow supported by S series switches (except S1700 switches) can analyze information about network flows, such as source and destination IP addresses, port numbers, and interfaces in data packets.

Can multicast packet source MAC addresses be learned
Yes, multicast packet source MAC addresses can be learned.

Whether the NAT policy of the USG2000 can replace the source IP address and destination IP address simultaneously
The bidirectional NAT function of the USG2000 can bidirectionally translate the destination IP address and source IP address simultaneously.

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